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We experimentally demonstrate ultra-compact (<0.008mm2), 4-channel CWDM demultiplexers using silicon photonic contra-directional couplers. Flat-top passbands of 10nm, insertion loss of lower than 1dB, and crosstalk of −20dB have been obtained.
We demonstrate a wide-bandwidth add-drop filter using silicon contra-directional couplers with a novel anti-reflection design. Single-band operation, with a bandwidth of 6.5nm and an extinction ratio of over 20dB, has been experimentally obtained.
We demonstrate narrow-bandwidth (< 1 nm) contradirectional couplers in silicon sidewall-modulated strip waveguides and slab-modulated rib waveguides, using a CMOS-compatible technology. They have box-like responses, low insertion losses, and no need of a circulator or isolator.
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